In computing, a code segment, also known as a text segment or simply as text, is a phrase used to refer to a portion of memory or of an object file that contains executable computer instructions. It has a fixed size and is usually read-only. If the text section is not read-only, then the particular architecture allows self-modifying code. Originally, the word computing was synonymous with counting and calculating, and a science that deals with the original sense of computing mathematical calculations. ... In computer science, object file or object code is an intermediate representation of code generated by a compiler after it processes a source code file. ... In computer science, an instruction typically refers to a single operation of a processor within a computer architecture. ... Rom is also the name of a toy and comic book character Rom (Spaceknight). ... Computer architecture is the theory behind the design of a computer. ... In computer science, self-modifying code is code that modifies itself on purpose. ...